PK-EOS Lens Mount Adapter Ring for Pentax Phoenix PK Lens to Canon EF EOS Camera Features: There is no ROM connection on the ring; diaphragm control of the lens needs to be set manually. This adapter allows you to use manual focus lenses designed for Pentax K mount. Solid and durable construction with high-precision machining; smooth copper interface ensures no abrasion between the lens and camera. Easy to install and operate; provides secure fit and smooth operation while protecting your camera and lens. Specification: Model: PK-EOS Type: Adapter Ring Compatible Lens: All manual PK lenses (for Pentax, Phoenix, Ricoh, Vivitar, etc.) Compatible Camera: Canon EOS DSLR cameras, including full-frame and film models Material: Metal Dimensions: 7 x 7 x 1 cm (approx) Color: Silver Quantity: 1 piece Note: Conversion: 1 cm = 10 mm = 0.39 inch No retail packaging included. Please allow 1-3 mm error due to manual measurement. Due to differences in monitor displays, the actual color may vary slightly from the image. Package includes: 1 x Lens Mount Adapter (other accessories shown in the image are not included)